Understanding Site Reliability Engineering (SRE): Roles, Responsibilities, Skills, and Differences from DevOps

In recent years, micro‑services and DevOps have become popular, and Site Reliability Engineering (SRE) has emerged alongside them. Although the term is only about three years old, it gained wide recognition in China after 2020, largely thanks to the book Site Reliability Engineering: How Google Runs Production Systems and its Chinese translation.

What is SRE? Literally “Site Reliability Engineer”, SRE’s primary duty is to ensure service stability throughout the entire software lifecycle—from initial requirement analysis to maintenance and eventual decommissioning. In essence, SRE is a form of IT Service Management that combines operations with a strong focus on user experience.

Core responsibilities are generally grouped into two areas:

IT Operations – designing infrastructure, deployment, CI, monitoring, fault detection and remediation.

Improving system availability – using code to enhance stability, performance, and scalability, thereby delivering value beyond traditional operations.

Typical tasks include keeping API latency below a target, achieving SLA of 99.9 %, backing up databases, building unified development environments, and designing log‑collection systems.

Skill requirements for SREs combine software engineering with deep knowledge of Linux, networking, databases, storage, and large‑scale distributed system design. SREs must be proficient programmers, problem‑solvers, and communicators capable of reading and modifying production code.

SRE vs. DevOps – Both emphasize automation, documentation, data‑driven decisions, and continuous improvement. DevOps describes a collaborative culture and workflow, while SRE is often a specific role that applies software engineering as the primary tool for operations. SRE introduces concrete practices such as error budgets, production‑readiness reviews, post‑mortems, and incident command systems.

Adopting SRE in other companies requires two basic conditions: having capable talent and sufficient budget. Organizations must invest in hiring or training engineers who can bridge development and operations, and allocate resources for the additional effort SRE work entails.

The referenced book is divided into five parts: Introduction, Principles, Practices, Management, and a detailed chapter list covering topics from risk handling to load balancing and incident management. The online version is freely available at https://landing.google.com/sre/ .